Determination of the phase diagram of the electron doped superconductor Ba(Fe1-xCox)2As2

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Systematic measurements of the resistivity, heat capacity, susceptibility and Hall coefficient are presented for single crystal samples of the electron-doped superconductor Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2}. These data delineate an x-T phase diagram in which the single magnetic/structural phase transition that is observed for undoped BaFe{sub 2}As{sub 2} at 134 K apparently splits into two distinct phase transitions, both of which are rapidly suppressed with increasing Co concentration. Superconductivity emerges for Co concentrations above x {approx}0.025, and appears to coexist with the broken symmetry state for an appreciable range of doping, up to x {approx} 0.06. The optimal superconducting transition ... continued below

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6 pages

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Chu, Jiun-Haw; Analytis, James G.; Kucharczyk, Chris; Fisher, Ian R. & /Stanford U., Geballe Lab. February 15, 2010.

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Systematic measurements of the resistivity, heat capacity, susceptibility and Hall coefficient are presented for single crystal samples of the electron-doped superconductor Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2}. These data delineate an x-T phase diagram in which the single magnetic/structural phase transition that is observed for undoped BaFe{sub 2}As{sub 2} at 134 K apparently splits into two distinct phase transitions, both of which are rapidly suppressed with increasing Co concentration. Superconductivity emerges for Co concentrations above x {approx}0.025, and appears to coexist with the broken symmetry state for an appreciable range of doping, up to x {approx} 0.06. The optimal superconducting transition temperature appears to coincide with the Co concentration at which the magnetic/structural phase transitions are totally suppressed, at least within the resolution provided by the finite step size between crystals prepared with different doping levels. Superconductivity is observed for a further range of Co concentrations, before being completely suppressed for x {approx} 0.018 and above. The form of this x-T phase diagram is suggestive of an association between superconductivity and a quantum critical point arising from suppression of the magnetic and/or structural phase transitions.

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6 pages

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  • Journal Name: Submitted to Physical Review B

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  • Report No.: SLAC-PUB-13892
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 972243
  • Archival Resource Key: ark:/67531/metadc935549

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  • February 15, 2010

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 15, 2016, 3:22 p.m.

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Chu, Jiun-Haw; Analytis, James G.; Kucharczyk, Chris; Fisher, Ian R. & /Stanford U., Geballe Lab. Determination of the phase diagram of the electron doped superconductor Ba(Fe1-xCox)2As2, article, February 15, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc935549/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.